This calculator outputs the how fast the Chevrolet Camaro Z28 can go in each gear as calculated by the gear ratios, engine redline and tire size.
The ultimate top speed may be limted by the power, drag and aerodynamics of each individual car.

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Tire Size(345/30/20)

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Tire Diameter(inches)

Final Drive Ratio

Redline (RPM)

1st Gear

2nd Gear

3rd Gear

4th Gear

5th Gear

6th Gear

7th Gear

8th Gear

RPM

1st Gear

2nd Gear

3rd Gear

4th Gear

5th Gear

6th Gear

7th Gear

8th Gear

500

4.05

7.6

12.39

17.7

0

0

0

0

600

4.86

9.12

14.87

21.25

0

0

0

0

700

5.67

10.64

17.35

24.79

0

0

0

0

800

6.48

12.17

19.83

28.33

0

0

0

0

900

7.29

13.69

22.31

31.87

0

0

0

0

1000

8.1

15.21

24.79

35.41

0

0

0

0

1100

8.91

16.73

27.27

38.95

0

0

0

0

1200

9.72

18.25

29.74

42.49

0

0

0

0

1300

10.53

19.77

32.22

46.03

0

0

0

0

1400

11.34

21.29

34.7

49.57

0

0

0

0

1500

12.15

22.81

37.18

53.11

0

0

0

0

1600

12.96

24.33

39.66

56.65

0

0

0

0

1700

13.77

25.85

42.14

60.2

0

0

0

0

1800

14.58

27.37

44.62

63.74

0

0

0

0

1900

15.39

28.89

47.09

67.28

0

0

0

0

2000

16.2

30.41

49.57

70.82

0

0

0

0

2100

17.01

31.93

52.05

74.36

0

0

0

0

2200

17.82

33.45

54.53

77.9

0

0

0

0

2300

18.63

34.97

57.01

81.44

0

0

0

0

2400

19.44

36.5

59.49

84.98

0

0

0

0

2500

20.25

38.02

61.97

88.52

0

0

0

0

2600

21.06

39.54

64.44

92.06

0

0

0

0

2700

21.87

41.06

66.92

95.61

0

0

0

0

2800

22.68

42.58

69.4

99.15

0

0

0

0

2900

23.49

44.1

71.88

102.69

0

0

0

0

3000

24.3

45.62

74.36

106.23

0

0

0

0

3100

25.11

47.14

76.84

109.77

0

0

0

0

3200

25.92

48.66

79.32

113.31

0

0

0

0

3300

26.73

50.18

81.8

116.85

0

0

0

0

3400

27.54

51.7

84.27

120.39

0

0

0

0

3500

28.35

53.22

86.75

123.93

0

0

0

0

3600

29.16

54.74

89.23

127.47

0

0

0

0

3700

29.97

56.26

91.71

131.01

0

0

0

0

3800

30.78

57.78

94.19

134.56

0

0

0

0

3900

31.59

59.31

96.67

138.1

0

0

0

0

4000

32.4

60.83

99.15

141.64

0

0

0

0

4100

33.21

62.35

101.62

145.18

0

0

0

0

4200

34.02

63.87

104.1

148.72

0

0

0

0

4300

34.83

65.39

106.58

152.26

0

0

0

0

4400

35.64

66.91

109.06

155.8

0

0

0

0

4500

36.45

68.43

111.54

159.34

0

0

0

0

4600

37.26

69.95

114.02

162.88

0

0

0

0

4700

38.07

71.47

116.5

166.42

0

0

0

0

4800

38.88

72.99

118.98

169.96

0

0

0

0

4900

39.69

74.51

121.45

173.51

0

0

0

0

5000

40.5

76.03

123.93

177.05

0

0

0

0

5100

41.31

77.55

126.41

180.59

0

0

0

0

5200

42.12

79.07

128.89

184.13

0

0

0

0

5300

42.93

80.59

131.37

187.67

0

0

0

0

5400

43.74

82.11

133.85

191.21

0

0

0

0

5500

44.55

83.64

136.33

194.75

0

0

0

0

5600

45.36

85.16

138.8

198.29

0

0

0

0

5700

46.17

86.68

141.28

201.83

0

0

0

0

5800

46.98

88.2

143.76

205.37

0

0

0

0

5900

47.79

89.72

146.24

208.92

0

0

0

0

6000

48.6

91.24

148.72

212.46

0

0

0

0

RPM

1st Gear

2nd Gear

3rd Gear

4th Gear

5th Gear

6th Gear

7th Gear

8th Gear

Some additional information on how these are calculated:

When D is the diameter of the tire, the car moves forward a distance πD with each revolution of the tire. If there are F revolutions per unit of time, it moves forward at a speed of πD´F per unit of time. If D is in inches and F is in revolutions per minute (rpm), the above result will be in inches per minute. There are 63,360 inches in a mile and 60 minutes in an hour, so one inch per minute equals 60/63360 miles per hour or 1/1056 mph. So we have the following formula:

V(mph) = D(in) ´ F(rpm) ´ (π/1056)

In the automotive industry, the coefficient 1056/π is usually taken to be equal to 336 (exactly it is 336.1352398...) and the formula corresponding to the above is:

(mph)(gear ratio)(336) = (tire diameter in inches)(rpm)

With the above numerical approximation, both formulas are identical if we consider that (rpm)/(gear ratio) is the rate of rotation of the tires. So the "gear ratio" as the number of rotations of the driveshaft for each turn of the tire. This ratio is normally more than 1, except in overdrive gear. So, calling R the "gear ratio", your final answer is:

V(mph) = D(in) ´ F(rpm) ´ (π/1056) / R

or, approximately: V = (D ´ F) / (336 ´ R)

where V is the velocity (in mph), D the tire diameter (in inches), F the engine rpm, and R the gear ratio.